Methods for manufacturing the casing wall, the casing wall of the laundry drum, and the laundry drum itself.

Abstract

This invention relates to a method for manufacturing a casing wall for a laundry drum used in household appliances for caring for laundry. The method comprises the steps of: providing a metal sheet; forming the metal sheet into a hollow cylinder; creating a radially outwardly bulging extended region within the hollow cylinder, the extended region being formed completely around the longitudinal axis of the hollow cylinder, and the edge of the extended region surrounding the longitudinal axis being spaced apart from the edge of the hollow cylinder, thereby forming an annular edge strip of the hollow cylinder between the edge of the extended region and the edge of the hollow cylinder; creating at least one molded structure having a plurality of molded elements in the extended region; and creating at least one compensating molded portion in the edge strip and / or in a tapered section of the extended region to locally adapt to a height of the edge strip measured in the axial direction.

Description

Technical Field

[0001] One aspect of the present invention relates to a method for manufacturing a mantelwand for a laundry drum in a household appliance for laundry care. Another aspect of the present invention relates to a mantelwand for a laundry drum. Yet another aspect of the present invention relates to a laundry drum for a household appliance for laundry care. Still another aspect of the present invention relates to a household appliance having a laundry drum for laundry care. Background Technology

[0002] Household appliances used for laundry care (such as washing machines or washer-dryers) have a laundry drum. This laundry drum typically has a hollow cylindrical shell wall.

[0003] In addition, the washing drum typically also has a bottom plate (Bodenscheibe) on the back side. Thus, the hollow cylindrical casing wall closes rearward. On the front side, the washing drum typically has a so-called end face bottom (Stirnboden). Both the end face bottom and the bottom plate are typically separate from the casing wall and connected to it. It is known in this regard that folded joints (Falzverbindungen) are formed between the aforementioned components.

[0004] To provide a suitable receiving volume for laundry, it is also known that the casing wall has radially outwardly oriented bulges. For example, a drum casing is known from EP 1 872 881 A2, in which a molded structure with multiple individual molded elements is formed. However, the molded elements are constructed relatively spaced apart from each other, thus limiting the number of molded elements. The arrangement here is that the already cylindrically bent drum casing is held in a fixed position during the molding process.

[0005] Furthermore, it is known that such casing walls have a radially extending region. This region extends radially further outward than the edge strips on the end sides of the roller casing. Such casing walls are known, for example, from WO 2011 / 064201A1. Multiple orifices are constructed in the radially extending region of the roller casing.

[0006] Furthermore, a laundry drum with a drum housing is known from KR 10 2020 0105071 A. In this case, a large, radially outwardly projecting molded area is constructed within the drum housing. Multiple orifices are formed within these molded areas.

[0007] In manufacturing laundry drums, a variety of process steps are necessary. These steps can lead to vastly different tolerances regarding the orientation and geometry of the drum casing. In this regard, tolerances may arise in the material properties of the raw material. Shape and dimensional deviations of the original sheet may occur after cutting the length from the material roll. Furthermore, misalignment of the butt joint edges may occur when welding the end edges of the casing wall. Material suction may also occur when the casing wall deforms or expands. For example, when the desired area of ​​material is cut from the reel for the casing wall, straight dividing edges may not be present. For instance, some degree of curvature may occur, resulting in a saber-like shape for the end edges of the raw material.

[0008] Similarly, if so-called expansion zones are also created in the casing wall of such a washing drum, then the roundness of this hollow cylindrical shape will no longer exist. Thus, for example, a degree of elliptic or polygonal shape may appear. It is precisely when such expansion zones are created that the height of the smaller radial edge strips (viewed in the direction of the longitudinal axis of the hollow cylinder) may differ so much in the circumferential direction around the longitudinal axis that it exceeds a certain tolerance. This can be disadvantageous when such edge strips (as explained above) are subsequently connected to the end face or bottom plate (especially to them via a folded edge). In short, a tolerance deviation of, for example, one millimeter or more may occur. However, such deviations (especially overall deviations) are undesirable.

[0009] Furthermore, problems may arise when creating overflow holes in a casing wall for a laundry drum, where a molded structure is formed with multiple molded elements arranged close together but relatively spaced apart. Due to tolerances (especially those already mentioned), the precise positioning of these overflow holes within these molded elements has so far been only achievable with relative imprecision. These overflow holes can only be constructed with a correspondingly wide mesh in the molded structure. If the molded elements are constructed more closely together, relatively large deviations in the position of these overflow holes may occur. This results in the degradation of the geometry of these overflow holes. Furthermore, undesirable burrs may appear on the edges of these overflow holes when cut open using a cutting tool. Summary of the Invention

[0010] The objective of this invention is to provide a method, a housing wall, and a laundry drum that improves the geometric configuration of the edge strips of the housing wall of the drum, either by the method or in the housing wall or the laundry drum.

[0011] This task is solved by a method, a housing wall, and a laundry drum according to the invention. In particular, this task is also solved by a household appliance for caring for laundry, having such a laundry drum.

[0012] One aspect of the present invention relates to a method for manufacturing a casing wall for a laundry drum of a household appliance for caring for laundry, comprising the following steps:

[0013] - Metal sheets are provided;

[0014] - To shape a metal sheet into a hollow cylinder;

[0015] - A radially outwardly bulging extended region is generated in a hollow cylinder, wherein the extended region is generated completely around the longitudinal axis of the hollow cylinder, and the edge of the extended region around the longitudinal axis is generated spaced apart from the edge of the hollow cylinder, thereby forming an annular edge strip of the hollow cylinder between the edge of the extended region and the edge of the hollow cylinder.

[0016] - To produce at least one molded structure having multiple molded elements in the extended region;

[0017] - Create at least one compensating molding portion in the edge strip and / or in the tapered section of the extended region to locally adjust / adapt the height of the edge strip measured in the axial direction.

[0018] Therefore, by such methods, it is possible to manufacture a housing wall and a washing drum that are more accurate in the geometry of the edge strip. This means, in particular, that the axial dimension of the edge strip in the circumferential direction around the longitudinal axis of the hollow cylinder is more uniform. In particular, it is possible to significantly reduce the deviation in axial height. Specifically, it is possible to minimize the axial dimensional deviation of the edge strip (viewed in the circumferential direction around the longitudinal axis) to a value less than or equal to + / -0.4 mm (especially to a value less than or equal to + / -0.3 mm). This is an important advantage: it improves the geometric accuracy during manufacturing. It also creates better conditions for the subsequent connection of the edge strip to the end face bottom or to the bottom plate. In particular, the hemmed connection becomes correspondingly more accurate and mechanically more stable.

[0019] It is particularly critical, when producing such a casing wall (or such a drum casing) for a laundry drum, having not only an extended area but also a tightly perforated molded structure, that the tolerances mentioned above may occur. This results in a significant deviation in the axial height of the edge strip. Such large axial dimensional deviations for the edge strip are possible precisely when the tightly perforated molded structure has an extended area that is fully and uninterruptedly constructed in the circumferential direction around the longitudinal axis. This is compensated for in a particularly advantageous manner by the present invention. Therefore, through such compensating molded portions in the edge strip and / or in the tapered sections of the extended area, a locally very limited adjustment / fitting of the height of the edge strip measured in the axial direction is achieved.

[0020] Because the location of such undesirable deviations in the axial dimensions of the edge strip is known very precisely during the manufacturing process, local compensating molding portions can be specifically counteracted. Therefore, in this invention, it is possible that the compensating molding portion is formed directly within the edge strip itself. Thus, the compensating molding portion is entirely located within the edge strip. Similarly, additionally or alternatively, it is also possible that at least one such compensating molding portion is constructed adjacent to the edge strip. That is, this is in the tapered section of the extended region. Viewed in cross-section, the extended region has this tapered region (or tapered section). This tapered region (or tapered section) directly abuts the edge strip and forms a radial bulge emanating from the edge strip. Adjacent to this tapered section, a substantially axial section of the extended region is thus formed. In cross-section, this region is therefore substantially parallel to the longitudinal axis of the hollow cylinder.

[0021] The compensating molding part is a molding part (Prägung) that is specifically designed to perform axial adjustment / adaptation of the height of the edge strip. Therefore, the compensating molding part is also specifically designed to achieve this desired adjustment of the axial height of the edge strip.

[0022] In one embodiment, the compensating molding portion is constructed only in sections along the circumferential direction around the longitudinal axis of the hollow cylinder. Therefore, the compensating molding portion is constructed in a partially closed circumferential manner.

[0023] In one embodiment, the molding structure is formed as a continuous molding zone only partially around the longitudinal axis of the hollow cylinder. Following this molding zone, an azimuth zone is formed in the circumferential direction around the longitudinal axis of the hollow cylinder. The azimuth zone differs from the molding zone. In particular, this relates to its width in the azimuth. Additionally or alternatively, this may also relate to the functionality of both zones. In particular, the azimuth zone is specifically provided for positioning or constructing the drive portion of the washing drum within the azimuth zone. In particular, the molding zone is not provided for arranging or constructing the drive portion within the molding zone. This does not apply to the molding zone, unlike an extended region that is constructed completely around (especially uninterruptedly) in the circumferential direction around the longitudinal axis. However, the molding zone is arranged in (or formed within) the extended region. In particular, the molding elements of the molding structure are formed only in the extended region. The molding elements of the molding structure are molding elements that differ from the at least one compensating molding portion. This applies not only to functionality and / or geometry but also to location.

[0024] In an advantageous embodiment, the method first involves separating the material region forming the size of the casing wall from the circulating reel. Then, in the proposed method, the plate is formed into a hollow cylinder before the expansion region is created and before the molding structure is created (and especially before the overflow hole is created). The end edges of the casing wall facing each other are then joined together. Specifically, these end edges are welded thereto. Subsequently, an outwardly bulging expansion region is created within the hollow cylinder. Then, the molding structure is subsequently created in this expansion region. It is possible to create at least one compensating molding portion simultaneously with the creation of the molding structure. Specifically, the compensating molding portion is created after the creation of the molding structure. That is, the complete molding structure is created first, and then at least one compensating molding portion is created.

[0025] In one embodiment, viewed in the circumferential direction around the longitudinal axis of the hollow cylinder, at least one compensating molding portion is formed at least partially at an azimuth position where the azimuth region is formed. Given that the molding structure (especially in its tightly packed configuration) in one embodiment is not constructed entirely around the longitudinal axis but also forms at least one azimuth region, it is precisely because of this that locally different axial heights of the edge strips may occur. This difference in axial height of the edge strips is particularly noticeable in the azimuth region, compared to the area where the molding structure is formed in the extended region. At least one compensating molding portion is formed thereto to adjust the axial height of the edge strip precisely at this azimuth position. In particular, at least one compensating molding portion is formed entirely within the azimuth width of the azimuth region over its entire azimuth length.

[0026] In one embodiment, at least one actuating portion of the laundry drum is constructed in the azimuth region of the extended area. In one embodiment, the actuating portion is a component independent of the housing wall. For example, a fastening structure can be constructed in the azimuth region for these independent actuating portions. This fastening structure may have, for example, fastening holes in the azimuth region. The actuating portion can then be fastened to these fastening holes.

[0027] In one embodiment, viewed around the longitudinal axis of the hollow cylinder, the compensating molding portion is formed as a locally surrounding rime. Therefore, the compensating molding portion is specifically configured as a ring segment around the longitudinal axis. This results in a relatively fine structure, but this structure particularly advantageously and accurately allows for local height adjustment of the edge strips. The compensating molding portion can extend in the relevant azimuth direction by at least 50%, especially at least 60%, especially at least 70%, especially at least 80% of the azimuth width of the azimuth region.

[0028] The compensating molding portion can be constructed in the edge strip as a molding portion that bulges outward radially.

[0029] In one embodiment, after the extended region is generated, at least a plurality of (especially at least three) centering receivers are generated within the extended region. These centering receivers are configured to: adjust the reference position of the hollow cylinder in the horizontal plane, at least for the subsequent generation of the molded structure. In particular, after the extended region is generated, the hollow cylinder can be oriented (or brought into the horizontal reference position) by embedding the element into the centering receiver before the generation of the molded structure. Thus, the generation of the molded structure is achieved particularly advantageously and precisely in the horizontal direction. Therefore, the molded structure can be generated with corresponding horizontal precision in the circumferential direction around the longitudinal axis in a particularly advantageous manner.

[0030] In one embodiment, the hollow cylinder is raised from a position (particularly in the direction of its longitudinal axis) in which it is arranged in the production equipment to create an extended area. In this raised position, these centering receiving portions are created. This is advantageous because the edges of the hollow cylinder may not be perfectly flat. If the hollow cylinder is placed on the auflage under these conditions, a certain degree of inclination relative to the vertical axis may occur. Therefore, if a molded structure is created in the hollow cylinder in this position, the molded structure is not precisely axially aligned around the longitudinal axis. These disadvantages are addressed by this raising and positioning in the reference position. Thus, the hollow cylinder is no longer positioned in this reference position with its relevant lower edge on the auflage of the production equipment.

[0031] In one embodiment, after the extended region is formed and before the molded structure is formed within the extended region, the edge strip is locally pre-tightened to the final diameter in the azimuth segment. Specifically, this pre-tightening occurs only locally in the azimuth segment. The final azimuth length can then be easily achieved through this process. In particular, considering the circular shape of the edge strip around the longitudinal axis, this can be achieved simultaneously with the formation of the molded structure.

[0032] This can also improve the accuracy of the individual geometry of components associated with edge strips and molded structures.

[0033] In one embodiment, the pre-tightening and molding structure of the azimuth segment in the extended region are generated at least temporarily and simultaneously.

[0034] Alternatively, in one embodiment, the azimuth segment, subsequently pre-tightened at the azimuth angle, bulges out in a uniformly convex, curved shape. This produces an edge strip with a geometry that is particularly rotationally symmetrical in the circumferential direction around the longitudinal axis. This corresponding variation of the azimuth segment pre-tightened at the azimuth angle can be performed simultaneously with the molding of the receiving portion for at least one carrying part in the extended region.

[0035] In one embodiment, the first molding structure is produced as a continuous molding area only partially around the longitudinal axis of the hollow cylinder. In particular, the continuous molding area is produced only partially around the longitudinal axis, wherein this molding area is produced as a second molding structure. This second molding structure is produced independently and separately from the first molding structure. In particular, the third molding structure is produced as a continuous molding area only partially around the longitudinal axis. In particular, this third molding structure is independent of the first and second molding structures. Relatedly, the third molding structure is also produced spatially apart from these two additional molding structures. These two molding structures are produced, particularly only in the extended regions of the casing wall. In one embodiment, viewed in the circumferential direction around the longitudinal axis, azimuth regions are formed between the two adjacent molding areas. Viewed in the circumferential direction around the longitudinal axis, this results in a pattern having a molding structure, then an azimuth region, then another molding structure, then another azimuth region, and then another molding region and then another azimuth region.

[0036] In one embodiment, the three molding zones are formed simultaneously. This ensures that the casing wall does not warp or deform even when radial forces are applied to the extended area. This is particularly advantageous in maintaining the symmetrical shape of the casing wall and, especially, the extended area. Here, the forming tools (or molds) of the production equipment are arranged equidistantly from each other in the circumferential direction around the longitudinal axis.

[0037] In one embodiment, immediately following the creation of the molding structure and the extended region, overflow holes are created in the extended region. These overflow holes are through-holes through which lye in the finished washing drum can flow to the outside. These overflow holes are, in particular, cut by a cutting tool of the production equipment.

[0038] In one embodiment, the single-layer edge strip is connected to the bottom (or bottom plate) of the detergent drum, which is independent of the hollow cylinder. Specifically, for this purpose, a folded connection is created between the edge strip and the bottom. Alternatively or additionally, in one embodiment, the single-layer edge strip is connected to the bottom end face of the detergent drum, which is independent of the hollow cylinder. Here, in an advantageous embodiment, a folded connection may also be created. Prior to creating the folded connection, the edge strip is constructed as a single layer.

[0039] Another aspect of the invention relates to a casing wall for a laundry drum, which can be obtained by a method according to the aspects mentioned above or advantageous embodiments thereof.

[0040] Another aspect of the invention relates to a laundry drum for a household appliance used for caring for laundry. The laundry drum has a hollow cylinder as its casing wall. This casing wall has an extended region that is perpendicular to the longitudinal axis of the hollow cylinder and thus bulges radially outward. The extended region is constructed to completely surround the longitudinal axis of the hollow cylinder. Therefore, the extended region is also constructed without interruption around the longitudinal axis. Furthermore, the extended region has an edge surrounding the longitudinal axis. This edge is constructed spaced apart from the edge of the hollow cylinder on its end side. An annular (especially single-layered) edge strip of the hollow cylinder is formed between the edge of the extended region and the hollow cylinder. At least one molding structure having a plurality of molding elements is constructed in the extended region. In particular, the molding structure is constructed only in this extended region. Furthermore, the laundry drum has at least one compensating molding portion independent of the molding elements of the molding structure. This compensating molding portion is constructed in the edge strip and / or in the tapered section of the extended region. The compensating molding section is constructed to locally adapt to the height of the edge strip measured in the axial direction. Therefore, this axial direction extends along the longitudinal axis of the hollow cylinder. This longitudinal axis of the hollow cylinder is also the longitudinal axis of the laundry drum.

[0041] The compensating molding part is constructed differently from the molding element in terms of function and location, as specified.

[0042] Advantageous embodiments of the methods mentioned above can also be considered advantageous embodiments of the laundry drum, particularly in terms of their results. In this regard, specific features of the laundry drum are thus formed.

[0043] In one embodiment, the molded structure is constructed with tightly packed (engmaschig) openings. This means that the molded elements are constructed directly adjacent to each other. Thus, for example, the boundary wall of one molded element is also the boundary wall of another molded element adjacent to it. In particular, the molded structure with molded elements is constructed as a honeycomb pattern (or as a honeycomb structure). The shape of the molded elements and therefore the boundary walls can be domed. In this regard, the domed arched structure (or cavity) is formed toward the longitudinal axis and thus toward the receiving volume of the wash drum. The boundary profile of such an arched shape of the molded element can be teardrop-shaped. This means that two profile edges are formed, especially symmetrically to each other. These profile edges can be formed in a wavy shape. The two profile lines connect to each other at the respective wavy ends. Thus, the relevant profile shape of the entrance of such a cavity-shaped molded element tapers toward the azimuth end. Therefore, in particular, the molded element is formed with a sharp angle at the opposite ends of its boundary profile in the azimuth.

[0044] In the method for manufacturing the casing wall for a laundry drum, particularly in the first step, after the hollow cylinder is formed, its verticality and roundness are calibrated. For this purpose, the casing wall is first placed on the edge receiving section of the production equipment. For radial alignment of the casing wall, the edge segment of the weld where the butt joint edges of the casing wall are joined is used as a centering mark. Accordingly, the casing is then received in a form-locking manner by the nose part (Nase) of the production equipment. In a further step, the three-piece forming molds of the production equipment extend from the center of the production equipment into the previously formed extended area, so that the extended area is calibrated centrally and perpendicularly to the longitudinal axis of the hollow cylinder. In particular, these forming molds have the shape of the extended area. Therefore, these forming molds are form-lockingly attached to the inner side of the casing wall in the extended area.

[0045] After the expanded area is centered and oriented at a right angle on the forming die, three new edge segments, including a centering hole (or centering receiving portion), are produced in a further step. As explained above, this enables the establishment of a reference position for the horizontal alignment of the hollow cylinder for subsequent processes.

[0046] During the final calibration to the final diameter of the centered hollow cylinder, as described above, in one embodiment, an elastic pre-twist (or pre-tightening) of the circumference of the roller housing (or housing wall) is performed (especially at the edge strips). Simultaneously, the molding structure is formed in the extended region. This allows for advantageous smoothing of the markings from the previous extended region formation step. Higher surface quality is achieved. Furthermore, shape stability is improved due to less material rebound caused by the pre-tightening. The resulting at least one compensating molding portion at least partially compensates for the varying axial heights of the edge strips. This results in uniform edge strips for hemming or folding.

[0047] In one embodiment, the forming die of the production equipment extends from the core to the final end position and slightly pre-tightens the casing wall circumferentially. This is particularly true in the edge strip. Then, the die section of the production equipment, configured to create the receiving structure for the carrier portion, is also conveyed forward. These die sections, in particular, fill the entire internal space of the casing wall (or hollow cylinder). Additionally, the outer section of the production equipment travels onto the casing wall and freezes the pre-tightened area of ​​the hollow cylinder to its final diameter. This is particularly true through a molding process for the molding structure and / or a molding process for the creation of the fastening structure for the carrier portion. The method explained above is particularly advantageous in this regard because geometrically precise edge strips are especially important for the hemming (or folding) process of casing walls with end faces and / or bottom discs. Thus, as already described above, an axial tolerance of less than or equal to + / - 0.3 mm in the height of the edge strip can be achieved.

[0048] The terms “up,” “down,” “front,” “back,” “horizontal,” “vertical,” “depth,” “width,” and “height” are used to indicate the position and orientation of the washing machine drum or appliance when it is used and positioned in accordance with regulations.

[0049] Another feature of the invention is derived from the claims, drawings, and description of the drawings. The features and combinations of features mentioned above in the specification, as well as those subsequently mentioned in the description of the drawings and / or shown separately in the drawings, can be used not only in the combinations specified but also in other combinations or individually, without departing from the framework of the invention. Therefore, such embodiments of the invention can also be considered included and disclosed: embodiments not explicitly shown and explained in the drawings, but which are known and can be produced by individual combinations of features from the explained embodiments. Such embodiments and combinations of features can also be considered disclosed: embodiments and combinations of features therefore do not possess all the features of the initially stated independent claims. Attached Figure Description

[0050] The embodiments of the invention will now be explained in more detail with reference to the illustrative drawings. The accompanying drawings show:

[0051] Figure 1 A perspective view showing an embodiment of a housing wall for a laundry drum according to the present invention;

[0052] Figure 2 A side view showing an embodiment of the casing wall for a laundry drum according to the present invention; and

[0053] Figure 3 A front view of an embodiment of a household appliance for laundry care according to the invention, having an embodiment of a laundry drum according to the invention, is shown.

[0054] In the accompanying drawings, identical or functionally equivalent elements are given the same reference numerals. Detailed Implementation

[0055] exist Figure 1 The diagram illustrates, schematically and in perspective, an embodiment of the casing wall 1 of a laundry drum for a household appliance used for laundry care. The drum casing or casing wall 1 has a longitudinal axis A. The casing wall 1 is integrally constructed (particularly of metal, especially stainless steel). The casing wall 1 is configured as a hollow cylinder 2. The casing wall 1 has an extended region 3 perpendicular to the longitudinal axis A and thus bulging outwards radially. The extended region 3 is constructed to completely surround the longitudinal axis A without interruption. Therefore, the extended region 3 is, to a certain extent, a surrounding bulge. In this embodiment, the extended region 3 is constructed spaced apart from the first hollow cylindrical edge 4 of the casing wall 1. In particular, the extended region 3 is also constructed spaced apart from the second hollow cylindrical edge 5. This means that the extended region 3 terminates shortened or retracted in these hollow cylindrical walls 4 and 5, which are opposite each other at their ends. For this purpose, the extended region 3 has a first circumferential edge 6. Furthermore, the extended region 3 has a second circumferential edge 7. These two edges 6 and 7 are constructed in a circumferential direction around the longitudinal axis A. Viewed in the axial direction, the first edge 6 is constructed spaced apart from the first hollow cylindrical edge 4. Similarly, the second edge 7 is constructed spaced apart from the second hollow cylindrical edge 5. As can be seen, an edge strip 8 of the casing wall 1 is formed between the first hollow cylindrical edge 4 and the first edge 6. The radius of this edge strip 8 is smaller than the radius of the extended region 3. The edge strip 8 is axially bounded by the edge 6 and the hollow cylindrical edge 4.

[0056] In one embodiment, another edge strip 9 is constructed between the second edge 7 and the second hollow cylinder edge 5. This other edge strip 9 has a smaller radius than the extended region 3. This other edge strip 9 is axially bounded by the edge 7 and the hollow cylinder edge 5.

[0057] The edge strip 8 is still constructed as a single layer here (or at this moment in the manufacturing process of the entire washing drum). The other edge strip 9 is also constructed as a single layer here.

[0058] The extended region 3 has a tapered section 10. The tapered section 10 terminates directly on the first edge 6. The tapered section 10 transitions outward from the first edge 6 into a tapered shape so as to transition into the hollow cylindrical section 11 of the extended region 3. Correspondingly, another tapered region 12 is also constructed on the axially opposite side. This other tapered region 12 terminates on the second edge 7 on one hand and on the hollow cylindrical section 11 on the other hand.

[0059] The edge strip 8 is constructed in a ring shape. The other edge strip 9 is constructed in a ring shape.

[0060] Furthermore, the housing wall 1 has a molding structure 13. In this embodiment, another molding structure 14 is also constructed. Additionally, in this embodiment, the housing wall 1 is provided with [the following details are missing here:] Figure 1 The third molding structure is not visible in the diagram. The three exemplary molding structures 13 and 14 are separate molding structures. These molding structures are equidistant from each other in the extended region 3 (particularly in the hollow cylindrical section 11 of the extended region 3) in the circumferential direction surrounding the longitudinal axis A. As can also be seen, an azimuth angle region 20, different from these molding structures, is constructed between these molding structures 13 and 14. Therefore, these two adjacent molding structures 13 and 14 are spaced apart from each other in the circumferential direction surrounding the longitudinal axis A. The azimuth angle region 20 is specifically provided for positioning the carrying part of the washing drum thereon. Furthermore, in the molding structure 13 and in… Figure 1 Another azimuth angle region is also constructed between another molded structure that is not visible in the image. Similarly, in molded structure 14 and in... Figure 1 Another azimuth angle region is constructed between the third molding structure that is not visible in the middle. These other azimuth angle regions are configured as follows: another driving part can be arranged on the inner side of the casing wall 1.

[0061] The molding structure 13 is configured as a continuous molding area. This molding structure 13 is formed only partially around the longitudinal axis A. Similarly, the molding structure 14 is configured as a continuous molding area and is formed only partially around the longitudinal axis A. Each molding structure 13, 14 has a plurality of molding elements 15. Only illustratively and exemplaryly, here... Figure 1 Some of the molded elements 15 are provided with reference numerals. In particular, as in this Figure 2As can be better seen in the image, the molding structures 13 and 14 are constructed in a honeycomb structure. This also means that the molding elements 15 are directly adjacent to each other. This also means that the boundary profile of one molding element is simultaneously the boundary profile of the adjacent molding elements. For example, in this… Figure 2 As can be seen in an advantageous embodiment, when viewed laterally from the housing wall 1, a molded element is constructed in a teardrop shape. This means that, in such a side view, the boundary profile of such a molded element 15 is constructed in a teardrop (or bulge) shape. This boundary profile converges with sharp, opposite ends in the azimuth angle. A boundary profile defines the opening entrance of the molded element 15, which is constructed as a cavity.

[0062] Such an external Figure 1 As can be seen, the housing wall 1 has fastening receiving portions 16. These fastening receiving portions 16 are provided for fastening the carrying part. In particular, when the carrying part is constructed as a separate component.

[0063] Furthermore, in this embodiment, centering openings are also constructed in the azimuth region 20. Preferably, such centering openings are constructed in each azimuth region 20. These centering openings (or centering receiving portions 17) are constructed in a horizontal plane. This allows the housing wall 1 to be in a horizontal reference position after a specific manufacturing intermediate state during manufacturing. This is particularly advantageous so that the molded structures 13, 14 can be subsequently produced during manufacturing and can be produced and oriented accordingly with appropriate horizontal accuracy.

[0064] In addition, the casing wall 1 has at least one compensating molding portion 18.

[0065] Overall, the compensating molding portion is a separate, pressed / molded compensating element. This compensating element is constructed spaced apart from these molding structures 13, 14 and thus spaced apart from the molding element 15. In one embodiment, the compensating molding portion 18 is constructed in the edge strip 8. In another embodiment, additionally or alternatively, the compensating molding portion 18 may also be constructed in the edge strip 9. In one embodiment, at least one compensating molding portion 18 is entirely constructed in the edge strip 8. The explanation given in this respect, as well as the explanation below, also applies to other exemplary embodiments, additionally or alternatively, to the edge strip 9.

[0066] In one embodiment, the compensating molding portion 18 is specifically designed to locally adapt the height h of the edge strip 8 measured in the axial direction and thus in the direction of the longitudinal axis A. This height h is measured between the first edge 6 and the edge 4 of the first hollow cylinder. Specifically, the compensating molding portion 18 is configured to adapt (or compensate) for this height h. Thus, the height h is formed over the entire edge strip 8 in the circumferential direction around the longitudinal axis A such that there is a maximum deviation of + / - 0.3 mm.

[0067] This can be seen relative to the reference height.

[0068] In one embodiment, at least one compensating molding portion 18 is configured in the circumferential direction around the longitudinal axis A, and thus in an azimuthal position, at which the azimuth region 20 also extends. In particular, at least one compensating molding portion 18 is formed entirely within the azimuthal length of the azimuth region 20. In one embodiment, the compensating molding portion 18 may be configured in the tapered section 10. This may be entirely or at least partially the case.

[0069] In one embodiment, the compensating molding portion 18 is a groove constructed in the circumferential direction around the longitudinal axis A. The compensating molding portion 18 forms a ring segment. The housing wall 1 constructed in this regard is a component of the laundry drum. Thus, the laundry drum may additionally have a bottom plate. The bottom plate is independent of the housing wall 1. The bottom plate is connected to the housing wall 1. In this regard, a hemming process (or folding process) can be provided. This forms a folded connection between the edge strip 9 and the bottom plate.

[0070] In one embodiment, such a laundry drum may have an end face bottom. This end face bottom is independent of the housing wall 1. This end face bottom can be connected to the housing wall 1 via a hemming process (or folding process). In particular, here, the edge strip 8 is connected to the end face bottom via a folding connection. This is a direct connection.

[0071] exist Figure 2 The casing wall 1 is shown in a side view. For clarity, the molding structure 14 is not shown here. Furthermore, as also... Figure 1 Like in the middle, in Figure 2 The diagram shows a connection portion 19, on which the mating edges of the substrate of the housing wall 1, which is shaped as a hollow cylinder, are connected to each other (especially welded together). Here, this is formed in the azimuth region 20.

[0072] To manufacture the roller wall or casing wall 1, a base plate for the casing wall 1 is first provided. This plate component is unfolded from a circulating reel and accordingly cut to a specific length.

[0073] Subsequently, the plate is rolled into a hollow cylinder 2 and joined together at their facing end edges. Specifically, a welded connection is formed here. The hollow cylinder 2 thus provided is then locally expanded radially in a production apparatus. For this purpose, corresponding expansion elements of the production apparatus can be introduced into the completed hollow cylinder 2, or the hollow cylinder 2 can be positioned accordingly such that the hollow cylinder 2 surrounds these expansion elements. These expansion elements (or forming molds) then move radially, thereby forming radially bulging expansion regions 3 within the hollow cylinder 2.

[0074] Then, in another production step, the already explained centering receiving section 17 is preferably formed.

[0075] It can be configured to form the fastening receiving section 16 simultaneously or before or after the centering receiving section 17 is generated.

[0076] If the centering receiving portion 17 is produced, the housing wall 1 (as it has been manufactured up to that point) is axially lifted and placed in a reference position. Therefore, the housing wall 1 is no longer located at the edge (or edge) of the edge receiving portion of the production equipment, but is hereby lifted. For this purpose, corresponding elements can be inserted into the centering receiving portion 17 and then adjusted to the desired reference position, which is the accurate horizontal orientation of the hollow cylinder hereby manufactured. Then, in this reference position, in further subsequent production steps, pre-tensioning is preferably performed on the edge strips 8 and / or 9. In particular, azimuth extension (Dehnen) is performed on the edge strips 9 and / or 8.

[0077] In another production step, molded structures 13, 14 are then produced in extended region 3. In particular, these individual molded structures 13, 14 are produced simultaneously. In one embodiment, the final diameter of edge strips 8 and / or edge strips 9 is also produced simultaneously with the production of the corresponding molded structures 13, 14. The pre-tightened state here is formed into the final convex geometry of these edge strips 8, 9.

[0078] In further (especially immediately thereafter) production steps, at least one compensating molded part 18 is produced.

[0079] It is possible that deformation of the centering opening 17 may also occur during molding. Therefore, in an advantageous embodiment, the creation of the centering opening 17 is also performed simultaneously with the manufacture of the fastening receiving portion 16. As a result, these centering openings 17 can be recalibrated for subsequent processes (especially for the flanges or edge strips 8, 9 for hemming or folding).

[0080] exist Figure 3The diagram schematically illustrates a household appliance 30 for washing clothes. This appliance 30 is, in particular, a washing machine. The washing machine has a housing 21. A washing drum 22 is arranged within the housing 21, the washing drum 22 having a cover wall 1. Furthermore, the washing drum 22 has a bottom plate 23 and an end face bottom 24, which is only symbolically indicated here by reference numerals. A longitudinal axis A is oriented perpendicular to the plane of the drawing. The washing drum 22 can rotate about this longitudinal axis A. Additionally, a door 25 is pivotally arranged on the housing 21. Thus, the washing drum 22 can be closed from the front.

[0081] Furthermore, the lye container 26 of the household appliance 30 is also shown with dotted lines. The washing drum 22 is received in this lye container 26. Additionally, in Figure 3 The actuating parts 27, 28, and 29 are shown only symbolically, and are arranged on the inner side of the housing wall 1. These actuating parts 27 to 29 are configured to actuate the laundry that has been placed inside when the laundry drum 22 rotates.

[0082] In addition, the casing wall 1 is also provided with multiple overflow holes. These overflow holes are through-holes, so that the lye solution in the washing drum 22 can reach the outside and can reach the lye solution container 26 through these overflow holes. For example, overflow holes can be formed in areas where molded structures 13, 14 are formed.

[0083] List of reference numerals

[0084] 1. Enclosure wall

[0085] 2. Hollow cylinder

[0086] 3. Extended Area

[0087] 4. Edge of the first hollow cylinder

[0088] 5. Edge of the second hollow cylinder

[0089] 6 First Edge

[0090] 7 Second Edge

[0091] 8 Edge stripes

[0092] 9. Edge stripes

[0093] 10 Conical Section

[0094] 11 Hollow cylindrical section

[0095] 12 Conical Regions

[0096] 13 Molded Structure

[0097] 14 Molded Structure

[0098] 15 Molded Components

[0099] 16 Fastening receiving part

[0100] 17. Open your mouth with a calm mind.

[0101] 18 Compensation Molding Section

[0102] 19 Connection parts

[0103] 20 azimuth zone

[0104] 21. Shell

[0105] 22 Laundry drum

[0106] 23 Bottom plate

[0107] 24 End face bottom

[0108] 25 doors

[0109] 26. Alkali solution container

[0110] 27. Carrying Department

[0111] 28. Carrying Department

[0112] 29. Carrying Department

[0113] 30 Household Appliances

[0114] h height

[0115] A. Vertical axis

Claims

1. A method for manufacturing a housing wall (1) for a laundry drum (22) used in a household appliance (30) for caring for laundry, the method comprising the following steps: - Metal sheets are provided; - The metal plate is shaped into a hollow cylinder (2); - A radially outward bulging extended region (3) is generated in the hollow cylinder (2). in, The extended region (3) is generated completely around the longitudinal axis (A) of the hollow cylinder (2), and the edges (6, 7) of the extended region (3) surrounding the longitudinal axis (A) are generated spaced apart from the hollow cylindrical edges (4, 5) of the hollow cylinder (2), thereby forming an annular edge strip (8, 9) of the hollow cylinder (2) between the edges (6, 7) of the extended region (3) and the hollow cylindrical edges (4, 5). Its features are, The method includes the following steps: - In the extended region (3), at least one molded structure (13, 14) having a plurality of molded elements (15) is produced. - At least one compensating molding portion (18) is generated in the edge strip (8) and / or in the tapered section (10, 12) of the extended region (3) to locally adapt to the height (h) of the edge strip (8, 9) measured in the axial direction.

2. The method according to claim 1, in, The molded structures (13, 14) are formed only locally around the longitudinal axis (A) as continuous molded areas, and An azimuth region (20) is formed by connecting the molding area in the circumferential direction of the longitudinal axis (A) surrounding the hollow cylinder (2).

3. The method according to claim 2, in, Viewed in the circumferential direction around the longitudinal axis (A), the at least one compensating molding portion (18) is generated at an azimuth position, forming the azimuth region (20) at the azimuth position.

4. The method according to claim 2 or 3, in, A carrying part (27, 28, 29) is constructed in the azimuth region (20) of the extended region (3).

5. The method according to any one of claims 1-3, in, The compensating molding part (18) is generated as a molding groove that partially surrounds the longitudinal axis (A).

6. The method according to claim 4, in, The compensating molding part (18) is generated as a molding groove that partially surrounds the longitudinal axis (A).

7. The method according to any one of claims 1-3 and 6, in, After the extended region (3) is generated, at least three centering receiving parts (17) are generated in the extended region (3), by means of which the hollow cylinder (2) can be adjusted in the horizontal plane to at least serve as a reference position for the subsequent generation of the molded structure (13, 14).

8. The method according to claim 7, The hollow cylinder (2) is positioned in the reference position before the molding structure (13, 14) is produced by embedding the element into the centering receiver (17).

9. The method according to claim 7, in, The hollow cylinder (2) is lifted from the following position: in which the hollow cylinder is arranged in a production device for generating the extended area (3), and the centering receiving part (17) is generated in the lifted position.

10. The method according to any one of claims 1-3, 6, 8, and 9, in, After the extended region (3) is generated and before the molded structure (13, 14) is generated in the extended region (3), the edge strips (8, 9) are locally pre-tightened to the final diameter in the azimuth segment.

11. The method according to claim 10, in, The edge strips (8, 9) are only partially pre-tightened to the final diameter in the azimuth angle segment.

12. The method according to claim 10, in, The pre-tightening of the azimuth angle segment in the azimuth angle and the generation of the molding structure (13, 14) in the extended region (3) are performed at least temporarily and simultaneously.

13. The method according to claim 10, in, Next, the pre-tightened azimuth section bulges into a uniformly convex, curved shape in the extended region.

14. The method according to claim 12, in, Next, the pre-tightened azimuth section bulges into a uniformly convex, curved shape in the extended region.

15. The method according to claim 13 or 14, in, The azimuth angle section, which is pre-tightened in the azimuth angle, bulges into a uniformly convex, curved shape in the extended region, which is simultaneously with the molding of the receiving part (16) for at least one carrying part (27, 28, 29) in the extended region (3).

16. The method according to any one of claims 1-3, 6, 8, 9, 11-14, in, The first molding structure (13) is generated only locally around the longitudinal axis (A) as a continuous molding zone. The second molding structure (14) is generated only locally around the longitudinal axis (A) as a continuous molding zone, and The third molding structure, as a continuous molding zone, is only locally generated around the longitudinal axis (A). Among them, an azimuth angle region (20) is formed between the two adjacent molding zones.

17. The method according to claim 16, in, The three molding zones mentioned above are generated simultaneously.

18. The method according to any one of claims 1-3, 6, 8, 9, 11-14, and 17. in, The single-layer edge strips (8, 9) are connected to the bottom plate (23) of the washing drum (22) which is independent of the hollow cylinder (2) and / or to the bottom end face (24) which is independent of the hollow cylinder (2). This results in a folded connection, and the edge strips (8, 9) are at least partially folded.

19. A housing wall (1) for a laundry drum (22), said housing wall being obtained by the method according to any one of the preceding claims.

20. A laundry drum (22) for a household appliance (30) for caring for laundry, the laundry drum having a hollow cylinder (2) as a housing wall (1) having an extended region (3) that bulges outwardly in the hollow cylinder (2). in, The extended region (3) is constructed to completely surround the longitudinal axis (A) of the hollow cylinder (2), and the edges (6, 7) of the extended region (3) surrounding the longitudinal axis (A) are constructed spaced apart from the hollow cylindrical edges (4, 5) of the hollow cylinder (2), thereby forming an annular edge strip (8, 9) of the hollow cylinder (2) between the edges (6, 7) of the extended region (3) and the hollow cylindrical edges (4, 5). At least one molded structure (13, 14) having a plurality of molded elements (15) is constructed in the extended region (3), and At least one compensating molding part (18) is constructed in the edge strip (8, 9) and / or in the tapered section (10, 12) of the extended region (3) to locally adapt to the height (h) of the edge strip (8, 9) measured in the axial direction.

21. The laundry drum (22) according to claim 20. in, The edge strips (8, 9) are folded edges.

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